Counterbalanced unloading device for trucks.



P. A. COOK. GOUNTEBBALANGED UNLOADING DEVICE FOR TRUCKS. APPLIOATION FILED 11011.11. 1911.

2 BHEETSBHEBT 1.

, 1 N i m 1 x WITNESSES: //v VEN TOR v ATTZI MEY I. A. 000K.

QOUNTBRBALANOED UNLOADING DEVICE FOR TRUCKS. APPLIOATION FILED NOV. 11. 1011.

Patented May 6, 1913.

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Qp v/e, m By 7 ATTORNEY FRED A. COOK, 0F PORTLAND, OREGON.

COUNTERBALANCED UNLOADING DEVICE FOR TRUCKS.

Specification of Letters Patent.

Patented May 6, 1913.

Application filed November 11, 1911. Serial No, 659,870.

To all whom it may concern:

Be it known that I, FRED A. Coon, a citi-' .and durable means by which the power of the driving engine is applied to move the body of the truck so as to dlscharge the load, and also to return the empty body to its normal position.

The further object of my invention is to include in said'd-evices means for balancing the body of the truck, while lifted or tilted on the running gear into position to discharge its load, and while being returned to its normal position, so as to eliminate all avoidable shocking and jarring of the vehicle, and minimize those not to be avoided, and in so/doing prolong the life of the vehicle and the devices provided for handling the load.

My invention also includes, the specific features hereinafter fully set forth.

Referring now to the accompanying draw.- ings, constituting a part of this specification: Figure 1 is a side elevation, in perspective, of the motor truck provided with a movable and tiltable body, and with my invention for handling such body; this view also shows, in dotted outline, the position of the vehiclebody when moved rearward prior to tilting the same; Fig. 2 is a larger-scale side elevation, in perspective, illustrating more clearly the arrangement and operation ofthe devices provided by me for han dling the vehicle body, also showing the counterr weight, and operating means thereof, provided by me for maintaining the vehicle body more or less in balance while being tilted and thus preventing severe shocking and jarring of the vehicle and the loadhandling devices; Fig. 3 is a sectional front elevation illustrating the clutch mechanism for applying the power of the driving eugine for moving the vehicle body into dumping position and returning it to its normal position; in this view the clutch is shown as adjusted for moving the body rearward in order to dump the load; Fig. 4. is a diagrammatic View illustrating the clutch mocha frame.

nism placed in its neutral position; and Fi 5 is a diagrammatic view of the clutch mec anism placed in position to cause the power applying and vehiclebody handling devices to work to return the vehicle-body to its normal position.

The truck-frame, a, wheels, I), motor-housmg, a, and seat, (1, in their entirety represent a common type of motor truck, made with a box-like body, 6, slidably mounted on rollers Z, Z, journaled in said frame, a, of the runnin gear. A shaft I, which may be the'axis of t e two rearmost rollers, has mounted on it a pinion g, in mesh with a rack h, rigidly fastened to the bottom of the body 6. On the shaft 7 is mounted a worm wheel (not shown) contained in a case, 2', in mesh with the worm (not shown) contained in a case j, said worm being connected by universal coupling j with a shaft 71:, on the right end of whichis rigidly mounted a pinion m of 2h: cutch mechanism 11, seen only in Figs.

A lever, 0, rotatably mounted on the shaft is of the pinion m, is formed with a forked lower extremity, on one member, of which is journaled a pinion q, in mcsi with the pinion 1', journaled on the other lever member p. InFig. 3 the pinion g is shown as also in mesh with the pinion s of the transmission box If, the latter being any convenient pinion included in the devices of said transmission box t.- In the position illustrated in Fig. 3, thelever, 0, is shown as moved to the left, and the pinion s, which is understood as driven in the direction indicated by the arrow, applies the power of the engine sons to drive. the shaft f for causing the .moving on the truck-body, e, rearward until it becomes'over-balanced and dumps its load. To the forward end of the body 6 are attached restraining chains, u, u, the lower ends of which are fastened to the truck- There is also mounted on said forward end a sheave-wheel 0, over which passes a chain w, rigidly attached at its lower end to the truck-frame a, and the upper end of such chain 10 is attached to a counter-weight :11, operating in ides rigidly attached to the bottom of the body When the truck-body is in its load-receiving position, the counter-weight is near the rear or left end of the guides 31, but upon tilting the bod y e, as in dumping, the chain in is relatively shortened and pulls the counterweight w forward, thereby balancing the vehicle-body, and its load more or less, and

restraining the too rapid tilting of the vehicle-body which would cause a severe jar to the vehicle, when themotion of the body 6 is' suddenly brought. to a stop. After the body assumes the position shown in 2-,,

such movement the body 6 is again over-- balanced, causing the forward end to drop onto the truck-frame a, the chain 10 will be relatively lengthened permitting the counter-weight to slide rearward on the guides 43/ and thus to 'a degree automatically a ain placing the vehicle-body more or less in alance on its pivoted center, which, as evident,

isthe pinion g, and minimizing the impact of the vehicle-body with the truck-frame a, while becoming reseated in its normal position on the latter. After the vehicle body has been returned to its normal position, the lever o is again brought to perpendicular or neutral position, as illustrated in Fig. 4.

The projections, z, z, restrain the body e against abnormal lateral motion.

I claim:

1. In a truck, the combination with the frame of the running gear and a'truck-bod supported longitudinally movable on suc truck-frame, the supporting devices also adapted to permit the tilting of the truckbody when moved rearward to the degree causing it to over-balance; of means for moving the truck-body. rearward and thus causing it to tilt on its fulcrum; a counterweight slidably supported at the forward end of the truck-body; and means adapted to cause said counter-weight to automatically move from and toward the fulcrum of the truck-body while the latter is tilting into discharging position and also while returning to its normal position.

2. In a truck, the combination with the frame of the running gear and a truck-body supported longitudinally movable on .such truck-frame, the supporting devices also adapted to permit the tilting of the truckbody when moved rearwardto the degree causing it to over-balance; a longitudinal guide afiixed under the.truck-body, a counter-weight sliding in such guide, a cable fastened at one end to the counter-weight and at its opposite end to the truck-body, a

sheave secured to the. forward end of the truck-body over which sheave said cable .a longitudinal passes; cause the counter-weight to move from and toward the fulcrum of the truck-body while the latter is tilting into discharging position and also while returning to its normal position.

'3. In a truck, the combination with the frame of the running gear and atruck-body supported longitudinally movable on such truckframe, the supporting devices also adapted to" permit the tilting of the truckbody when moved rearward to the degree causing it to over-balance; a longitudinal guide aflixed under the truck-body, a counter: v

sliding in such guide, a cable fasweight end to the counter-weight and tened at one at its opposite end to the truck-body,',a

sheave secured to the forward end of the truck-body over which sheave said cable passes; a cable connecting the forward end of the truck-body with the truck-frame; and the devices being adapted to cause the counand the devices being adapted to.

ter-weight to move from and toward the fulcrum of the truck-body while'the latter is tilting into discharging position and also while returning to its normal position.

In a truck, the combination with the frame of the running gear and a truck-body supported longitudinally movable on such truck-frame; a rack extending longitudis nally under the truck-body, a pinion engaging said rack, means for rotating thepinion;

a counter-weight slidably supported at the forward end of the truck-body; and means adapted to cause said counter-weight to automatically move from and toward the fulcrum of the truck-body while the latter is tilting into dischargingposition and also while returning to its normal position.

5. In a truck, the combination with the frame of the running gear and a truck-body supported longitudinally movable on such truck-frame; a rack extending longitudinally under the truck-body, a pinion engagv ing. said rack, means for rotating-the pinion;

guide affixed under the truckbody, a counter-weight sliding in such guide, a cable fastened at one end to the counterweight and at its opposite end to the truckbody, a sheave secured to the forward end of the truck-body over which sheave said cable passes; and the devices being adapted to cause the counter-weight to move from and toward the fulcrum ofthe truck-body while the latter is tilting into discharging position and also while returningto its normal position. v 6. In a truck, the combination with the frame of the running gear and a truck-body supported longitudinally movable on such truckframe; a rack extending longitudinally under the truck-body, a pinion engaging said rack, means for rotating the pinion; a longitudinal guide aflixed under the truckbody, a counter-weight sliding in such guide,

a cable fastened at one end to the counterthe fulcrum of the truck-body while the latweight and at its opposite end to the truckter is tilting into discharging position and 10 body, a sheave secured to the forward end also while returning to its normal position. of the truck-body over which sheave said cable asses; a cable connecting the forward FRED COOK end 0% the truck-body with the truck-frame; 'Witnessesu and the devices being adapted to cause the CECIL LONG,

counter-weight to move from and toward WV. LEWIS COOP.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Iatents, Washington, D. 0. 

